fix(journaling): optimize serper video search queries to prevent MDX hallucination

packages/journaling/src/agent.ts

@@ -190,11 +190,21 @@ Return JSON: { "facts": [ { "statement": "...", "source": "Organization Name Onl
       messages: [
         {
           role: "system",
-          content: `Generate a YouTube search query to find a high-quality, professional educational video about: "${topic}".
-Prefer official tech channels or well-known developers (e.g., Google Chrome Developers, Vercel, Theo - t3.gg, Fireship, etc.). 
-Return a JSON object with a single string field "query". Example: {"query": "core web vitals explanation google developers"}.
-DO NOT USE QUOTES IN THE QUERY ITSELF.`,
+          content: `You generate ultra-short, highly relevant YouTube search queries based on a given text context.
+
+RULES:
+1. Extract only the 2-4 most important technical or business keywords from the provided text.
+2. Ignore all markdown syntax, frontmatter (---), titles, and descriptions.
+3. Keep the query generic enough to find popular educational tech videos.
+4. DO NOT append specific channel names (e.g., "Fireship", "Vercel") to the query.
+5. DO NOT USE QUOTES IN THE QUERY.
+
+Return a JSON object with a single string field "query". Example: {"query": "core web vitals performance"}`,
         },
+        {
+          role: "user",
+          content: `CONTEXT: ${topic}`,
+        }
       ],
       response_format: { type: "json_object" },
     });
@@ -289,7 +299,7 @@ CRITICAL: Do NOT provide more than 2 trendsKeywords. Keep it extremely focused.`
     try {
       let parsed = JSON.parse(
         response.choices[0].message.content ||
-          '{"trendsKeywords": [], "dcVariables": []}',
+        '{"trendsKeywords": [], "dcVariables": []}',
       );
       if (Array.isArray(parsed)) {
         parsed = parsed[0] || { trendsKeywords: [], dcVariables: [] };